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<h2>算术运算符</h2>
${1 }+${3 }<br>
<!-- 加法 -->
${1+3 }<br>
<!-- 除法 -->
${6 div 2 }<br>
${6*2 }<br>
<!-- 求余 -->
${7 mod 2 }<br>
${7%2 }<br>
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